A critical firmware vulnerability affecting motherboards from major manufacturers including Gigabyte, MSI, ASRock, and ASUS has been discovered by Riot Games’ Vanguard anti-cheat team.
The vulnerability, dubbed “Sleeping Bouncer,” allows sophisticated hardware-based cheats to inject malicious code during the earliest stages of system boot, bypassing security protections that appeared to be active.
The security vulnerability centers on Pre-Boot DMA Protection, a feature designed to leverage the system’s Input-Output Memory Management Unit (IOMMU) to prevent unauthorized Direct Memory Access during boot.
https://gbhackers.com/sleeping-bouncer/